[heap] Remove Marking::MarkBlack and some minor cleanups.

src/heap/mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/mark-compact.h"
 
 #include "src/base/atomicops.h"
 #include "src/base/bits.h"
 #include "src/base/sys-info.h"
 #include "src/code-stubs.h"
@@ skipping 372 matching lines @@
     page->ClearLiveness();
   }
 }
 
 
 void MarkCompactCollector::ClearMarkbits() {
   ClearMarkbitsInPagedSpace(heap_->code_space());
   ClearMarkbitsInPagedSpace(heap_->map_space());
   ClearMarkbitsInPagedSpace(heap_->old_space());
   ClearMarkbitsInNewSpace(heap_->new_space());
-
-  LargeObjectIterator it(heap_->lo_space());
-  for (HeapObject* obj = it.Next(); obj != NULL; obj = it.Next()) {
-    ObjectMarking::ClearMarkBit(obj);
-    MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address());
-    chunk->ResetProgressBar();
-    chunk->ResetLiveBytes();
-  }
+  heap_->lo_space()->ClearMarkingStateOfLiveObjects();
 }
 
 class MarkCompactCollector::Sweeper::SweeperTask : public v8::Task {
  public:
   SweeperTask(Sweeper* sweeper, base::Semaphore* pending_sweeper_tasks,
               AllocationSpace space_to_start)
       : sweeper_(sweeper),
         pending_sweeper_tasks_(pending_sweeper_tasks),
         space_to_start_(space_to_start) {}
 
@@ skipping 3654 matching lines @@
       // The target is always in old space, we don't have to record the slot in
       // the old-to-new remembered set.
       DCHECK(!heap()->InNewSpace(target));
       RecordRelocSlot(host, &rinfo, target);
     }
   }
 }
 
 }  // namespace internal
 }  // namespace v8